Make arcane barrage the alternate for arcane blast for level 60 mages (#2401)

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## Pull Request Description
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Adds arcane barrage as the alternate for arcane blast so level 60 arcane
mages who dont have arcane blast yet will use arcane barrage whenever
available.
For level 60 arcane mages, its actually better dps to alternate between
arcane barrage and arcane missiles to fish for Missile Barrage procs.

Before:
<img width="576" height="403" alt="Screenshot_20260518_024601"
src="https://github.com/user-attachments/assets/567f198f-3655-4449-86e6-2cfffd19a529"
/>

After:
<img width="579" height="381" alt="Screenshot_20260518_025040"
src="https://github.com/user-attachments/assets/803f5380-58d3-490a-a3b1-e2941e2f0048"
/>


## Feature Evaluation
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Have a level 60 arcane mage dps a dummy. To compare to the old
"rotation" of just using arcane missiles you can "ss Arcane Barrage"

## Impact Assessment
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tick) can help you here. -->
- Does this change increase per-bot/per-tick processing or risk scaling
poorly with thousands of bots?
    - - [x] No, not at all
    - - [ ] Minimal impact (**explain below**)
    - - [ ] Moderate impact (**explain below**)



- Does this change modify default bot behavior?
    - - [x] No
    - - [ ] Yes (**explain why**)



- Does this change add new decision branches or increase maintenance
complexity?
    - - [x] No
    - - [ ] Yes (**explain below**)



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- - [ ] Yes (**explain below**)
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## Final Checklist

- - [x] Stability is not compromised.
- - [x] Performance impact is understood, tested, and acceptable.
- - [x] Added logic complexity is justified and explained.
- - [x] Any new bot dialogue lines are translated.
- - [x] Documentation updated if needed (Conf comments, WiKi commands).

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Co-authored-by: Keleborn <22352763+Celandriel@users.noreply.github.com>

src/Ai/Class/Mage/Strategy/ArcaneMageStrategy.cpp

@@ -6,9 +6,31 @@
 #include "ArcaneMageStrategy.h"
 #include "Playerbots.h"
 
+// ===== Action Node Factory =====
+class ArcaneMageStrategyActionNodeFactory : public NamedObjectFactory<ActionNode>
+{
+public:
+    ArcaneMageStrategyActionNodeFactory()
+    {
+        creators["arcane blast"] = &arcane_blast;
+    }
+
+private:
+    // Arcane Barrage is the alternate for Arcane Blast (cast while moving, or
+    // when Arcane Blast is unavailable - e.g. not yet learned at low levels).
+    static ActionNode* arcane_blast([[maybe_unused]] PlayerbotAI* botAI)
+    {
+        return new ActionNode("arcane blast",
+                              /*P*/ {},
+                              /*A*/ { NextAction("arcane barrage") },
+                              /*C*/ {});
+    }
+};
+
+// ===== Single Target Strategy =====
 ArcaneMageStrategy::ArcaneMageStrategy(PlayerbotAI* botAI) : GenericMageStrategy(botAI)
 {
-    // No custom ActionNodeFactory needed
+    actionNodeFactories.Add(new ArcaneMageStrategyActionNodeFactory());
 }
 
 // ===== Default Actions =====